[Bug libelf/23903] Uses linux specifc mremap

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23903

--- Comment #9 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Jean Michault from comment #8)
> Created attachment 11932 [details]
> patch to allow compile on systems without mremap
> 
> I suggest the patch attached.
> This makes it possible to compile elfutils on nonlinux systems, but
> generates an error if one tries to use features that need mremap.

Thanks. Some questions about the proposed patch:
- What defines HAVE_MMAP?
  I don't believe we currently have a configure check for it, should we?
- The guard checks for HAVE_MMAP, but the code calls mremap.
  Should we have a HAVE_MREMAP guard and configure check instead?
- On which systems did you test and what were the make check results?

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